Dispose of the body: add lime and salt to the bath and fill with water. After a period of time, the water is released, leaving only a small amount of muscle, internal organs and intact bones.
At this point you can choose to repeat the above steps until the bones are left. Remove the bones from the bathtub and use an acidic substance to eliminate the domino reaction and pour a large amount of toilet agent into the sewer.
Put the bones into the pressure cooker with a boning knife for dozens of hours, then put the vinegar for a few hours, the hammer is chopped, the toilet washes away (there was a time caught by this time…)